Active Stylus Dual Electrode Signal Detection Circuit
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Solution Overview
Problem
Traditional active styluses have limitations such as having only one head electrode, increased components and cost, higher energy consumption, and vulnerability to falling and shaking, which restrict their functionality and durability.
Innovation Solution
The active stylus incorporates a processing circuit with a driving circuit for emitting electrical signals, a sensing circuit for detecting beacon signals, and an interconnection network connecting the head and tail electrodes. This configuration allows concurrent detection of beacon signals and emission of tail and head signals in adjacent periods, reducing components and power consumption while enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional active stylus uses only one head electrode, then the structure is simple, but additional touch control via tail cannot be achieved
Solution Approach 1:
The stylus is designed with both head electrode and tail electrode that can function as active touch input devices. The tail electrode can independently transmit electrical signals to the touch panel, enabling additional touch control functions beyond the traditional head-only operation, thus achieving multi-functionality.
Solution Approach 2:
The stylus structure is divided into two functional segments: the head electrode and the tail electrode. Each segment can operate independently as an active touch input device, allowing the user to perform touch operations from either end of the stylus, thereby increasing versatility without requiring a completely new design.
2Adaptability or versatility
If traditional active stylus uses multiple components for head and tail signals, then functionality is enhanced, but cost and device complexity increase
Solution Approach 1:
The driving circuit and sensing circuit are merged into a single integrated processing circuit that handles both head electrode and tail electrode operations. The interconnection network dynamically connects the processing circuit to either the head or tail electrode based on operational requirements, eliminating the need for separate dedicated circuits for each electrode and reducing overall component count.
Solution Approach 2:
The interconnection network employs dynamic switching to connect the processing circuit to different electrodes (head or tail) based on the current operational mode. This dynamic reconfiguration allows a single set of circuits to serve multiple functions, reducing component complexity while maintaining full functionality for both head and tail touch operations.
3Measurement precision
If traditional active stylus uses separate receiving channels for head and tail, then signal detection is accurate, but synchronization issues and power consumption increase
Solution Approach 1:
A single receiving channel is used to detect beacon signals from both the head electrode and the tail electrode. The processing circuit determines which electrode received the beacon signal and proceeds with the appropriate signal transmission sequence, thereby reducing power consumption while maintaining accurate signal detection through intelligent signal processing.
Solution Approach 2:
The signal transmission operates in periodic phases: first detecting the beacon signal during a beacon signal period, then transmitting tail signals during a tail signal period, and finally transmitting head signals during a head signal period. This periodic, sequential operation allows a single receiving channel to efficiently handle both electrodes without continuous operation, reducing overall power consumption.
4Reliability
If traditional active stylus uses guard period between signal periods, then signal synchronization is maintained, but time efficiency decreases
Solution Approach 1:
The signal transmission follows a structured periodic sequence with distinct phases: beacon signal detection period, tail signal period, and head signal period. Each phase is clearly defined and sequentially executed, maintaining signal synchronization through the periodic structure while eliminating unnecessary guard periods between phases, thereby improving time efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the active stylus to perform additional touch functions via its tail, reduces costs and power consumption, and improves resistance to falling and shaking, thereby enhancing its overall functionality and user experience.
Implementation Method 1
a sensing circuit for detecting beacon signals
Implementation Method 2
a driving circuit for emitting electrical signals
Data Source
AI summary
The present application is related to active stylus which can detect beacon signals via its head and tail and is also related to touch sensitive processing apparatus and touch system corresponding to the active stylus. According to received signals during a head signal period and a tail signal period after the beacon signals is received, the touch sensitive processing apparatus can determine an approximating or touching position of the active stylus and a head or tail information. Based on the head or tail information, the touch system can respond differently.